A composite test chamber

Abstract

The application discloses a composite test box, and relates to chemical or physical experimental equipment, which comprises an open box and a base, and a heating device and a humidity control device are fixedly arranged in the box; a guide rail is arranged on the inner wall of the inner cavity of the box, an accelerating wheel is rotatably arranged on the top of the inner cavity of the box, and one side of the accelerating wheel is located in the guide rail; an electromagnet is fixedly arranged on the accelerating wheel, and an impact plate is attracted to the electromagnet; the accelerating wheel rotates and can rotate together with the impact plate; and the base is fixedly arranged on the bottom of the inner cavity of the box. The accelerating wheel and the impact plate are adopted, the accelerating wheel can rotate together with the impact plate when rotating, and the initial speed of the impact plate is provided. When the accelerating wheel moves together with the impact plate to the tangent position of the guide rail, the impact plate enters into the guide rail along the tangent direction from the decelerating wheel, falls in the guide rail, and impacts the part to be tested. The movement height of the impact plate is reduced by accelerating the impact plate through the accelerating wheel.

Description

TECHNICAL FIELD

[0001] The present application relates to chemical or physical experimental equipment, in particular to a composite test box. BACKGROUND

[0002] In the manufacturing process of electronic products (such as circuit boards, glass, mobile phones, notebook computers, etc.), automobiles, electrical appliances, etc., it is often necessary to test them accordingly, such as mechanical impact test, and service life under normal temperature environment or extreme environment. The product often needs to be tested. The most common test device is a dispersed test, that is, a separate test method is used to test the product. For example, the common high-low temperature realization box, humidity test box, mechanical impact test bench / machine and vibration test bench are all separate devices. When testing the product, different realization devices need to be used, which is not convenient to use.

[0003] In recent years, a temperature and humidity test box has appeared, which controls temperature and humidity in the same box to simulate the working environment of the product. The combination of the two boxes is more flexible, but the mechanical impact test or vibration test is a separate device and is not well combined with the temperature and humidity test box. In particular, for mechanical impact testing, the common drop type mechanical impact test bench needs sufficient height to meet different impact requirements, and the height is at least one meter. Therefore, the present application provides a new impact mode to facilitate the combination of the temperature and humidity test box. SUMMARY

[0004] The purpose of the present application is to provide a composite test box to solve the problems in the background art.

[0005] To solve the above technical problems, the present application provides the following technical scheme: a composite test box, comprising a box with one side open, a heating device and a humidity control device fixedly installed inside the box;

[0006] A guide rail is formed in the side wall of the inner cavity of the box, and an acceleration wheel is rotatably installed at the top of the inner cavity of the box, one side of the acceleration wheel being located in the guide rail;

[0007] An electromagnet is fixedly installed on the acceleration wheel, and an impact plate is attracted to the electromagnet. The acceleration wheel rotates to rotate the impact plate together, thereby providing the impact plate with a rotational speed;

[0008] A base is fixedly installed at the bottom of the inner cavity of the box and serves as a bearing table for experimental parts.

[0009] Preferably, the guide rail is fixedly installed on the two symmetrical inner side walls of the box;

[0010] The top of the two symmetrical inner side walls of the box body is fixedly provided with an outwardly protruding mounting ring, and the accelerating wheel is rotatably mounted in the mounting ring and flush with the inner side walls of the box body and the guide rail on the side facing the inside of the box body;

[0011] The two accelerating wheels are fixedly provided with a connecting shaft,

[0012] The outer side of the box body is further fixedly provided with a driving component for rotating the connecting shaft and the accelerating wheel.

[0013] Preferably, the side of the guide rail close to the accelerating wheel is communicated with the mounting ring, and the edge of the accelerating wheel can move into the guide rail.

[0014] Preferably, the side of the box body is fixedly provided with a motor, and the output shaft of the motor is fixedly connected with the connecting shaft.

[0015] Preferably, the accelerating wheel is made of magnetic conductive material, and a coil and an iron core are fixedly provided in the accelerating wheel, and under the electrified state, the coil can make the iron core generate magnetic force to magnetically fix the impact plate on the accelerating wheel.

[0016] The connecting shaft penetrates through the accelerating wheel and is fixedly connected with the accelerating wheel, and a wire is connected between the coil and the connecting shaft.

[0017] The end of the connecting shaft extending out of the box body is fixedly provided with an electric brush, and the electric brush is connected with direct current for supplying power to the coil.

[0018] Preferably, the top of the base is provided with a mounting groove, and an upwardly extending bearing plate is mounted in the mounting groove, and when the bearing plate is located in the mounting groove, the top of the bearing plate is flush with the upper end surface of the base.

[0019] Suppose the movement time of the impact plate can be directly measured as t1, and the speed of the impact plate moving to the bottom of the base is V2, then:

[0020] V2=V1+gt1 (2)

[0021] In the formula, g is the acceleration of gravity, and V1 is the initial speed of the impact plate.

[0022] During the impact test, the impact plate hits the workpiece, and its speed decreases from V2 to 0, and the impact time is t2,

[0023] According to the momentum formula: Ft2=m×V2 (3)

[0024] In the formula, m is the mass of the impact plate, and F is the acting force.

[0025] From the above formulas (1), (2) and (3), it can be obtained that:

[0026] Ft2=m·(Wr+gt1) (4)

[0027] The impact plate has an initial speed V1 when moving in the vertical direction, which is provided by the accelerating wheel, that is, the speed can directly act on the part to be tested; since the impact plate has a high initial speed, the height of the movement of the impact plate 4 can be ignored; the time of the vertical movement of the impact plate can be ignored; then formula (4) can be approximated as: Ft2=mWr

[0028] It can be seen from the analysis that the impulse Ft2 is related to the rotating speed W of the accelerating wheel, and the greater the rotating speed W, the greater the impulse.

[0029] Preferably, the bottom of the mounting groove is fixedly provided with a hydraulic rod, the telescopic end of the hydraulic rod is fixedly provided with a first motor, the output end of the first motor is fixedly provided with a rotating seat, an eccentric connecting column is arranged on the rotating seat, a cylindrical barrel is rotatably arranged outside the connecting column, and the top of the cylindrical barrel is fixedly connected with the bottom of the bearing plate.

[0030] When the first motor rotates, the rotating seat can rotate coaxially, the connecting column can swing around the axis of the first motor with the cylindrical barrel and the bearing plate, so as to generate transverse vibration.

[0031] Preferably, a horizontal plate is arranged on the rotating seat through a fastening bolt, and the horizontal plate can rotate around the axis of the fastening bolt by loosening the fastening bolt.

[0032] The connecting column is fixedly arranged on the upper end surface of the horizontal plate and is arranged eccentrically with the rotating axis of the rotating seat.

[0033] Preferably, springs are fixedly arranged between the bottom of the bearing plate and the bottom of the mounting groove.

[0034] Compared with the prior art, the present application has the following advantages:

[0035] The present application comprises an accelerating wheel and an impact plate, the accelerating wheel can rotate with the impact plate and provide an initial speed for the impact plate when rotating. When the accelerating wheel moves with the impact plate to the tangent position of the guide rail, the impact plate enters the guide rail along the tangent direction from the decelerating wheel and falls in the guide rail to impact the part to be tested. Since the accelerating wheel is used to accelerate the impact plate, the movement height of the impact plate is reduced, and the whole device is smaller. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 It is a structural diagram of the present application as a whole;

[0037] Figure 2 It is a sectional view of the present application;

[0038] Figure 3 It is a sectional view of the falling of the impact plate of the present application;

[0039] Figure 4The sectional view of the core, connecting shaft and conductive ring of the present application;

[0040] Figure 5 The sectional view of the box, accelerating wheel and bearing plate of the present application;

[0041] Figure 6 The structure of the present application Figure 5 The enlarged view of A in the figure;

[0042] Figure 7 The structure of the base and bearing plate of the present application;

[0043] Figure 8 The connection diagram of the base, bearing plate and first motor of the present application;

[0044] Figure 9 The sectional view of the bearing plate of the present application;

[0045] Figure 10 The structure of the cross plate and bearing plate of the present application in the inclined state;

[0046] Figure 11 The analysis diagram of the cross plate and bearing plate of the present application in the inclined state;

[0047] Figure 12 The structure of the bearing ring and cross plate of the present application.

[0048] In the figure: 1, box; 2, accelerating wheel; 3, guide rail; 4, impact plate; 5, base; 6, mounting ring; 7, connecting shaft; 8, motor; 9, mounting groove; 10, spring; 11, support plate; 12, bearing plate; 13, hydraulic rod; 14, first motor; 15, rotating seat; 16, cross plate; 17, fastening bolt; 18, connecting column; 19, cylindrical barrel; 20, bearing ring. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0050] Please refer to the shown in the figure, the present embodiment provides a kind of composite test box, including the box body 1 of one side opening, bottom mounting is fixed in the inner chamber of box body 1, base 5 is used as the bearing platform of experimental parts, for placing the spare part needing to do experiment.Heating device and humidity control device are fixedly installed in the inside of box body 1;Heating device and humidity control device can refer to the model GD (J) S-100 temperature and humidity test box of Beijing Yashilin Experimental Equipment Co., Ltd.or CLM-GD (J) S-100 temperature and humidity test box.

[0051] As shown in Figure 1 The inner chamber side wall of box body 1 is provided with guide rail 3, and guide rail 3 is fixedly installed on the two symmetrical inner side walls of box body 1.

[0052] The top of the two inner side walls of box body 1 is fixedly installed with the mounting ring 6 protruding outward, and the two mounting rings 6 are located on the side wall provided with guide rail 3 respectively.As shown in Figures 1-3 The mounting ring 6 is rotatably installed with acceleration wheel 2, and the side of acceleration wheel 2 towards the inside of box body 1 is flush with the inner side wall of box body 1 and guide rail 3, as shown in Figure 1 The side of guide rail 3 close to acceleration wheel 2 is communicated with mounting ring 6, and the edge of acceleration wheel 2 can move into guide rail 3.

[0053] The connecting shaft 7 is arranged between the two acceleration wheels 2, the connecting shaft 7 penetrates the acceleration wheel 2 and is fixedly connected with the acceleration wheel, the connecting shaft 7 connects the two acceleration wheels 2 together, the center of mounting ring 6 is provided with shaft hole, and the connecting shaft 7 is rotatably installed in the shaft hole.The outside of box body 1 is also fixedly installed with motor 8, and the output shaft of motor 8 is fixedly connected with connecting shaft 7, motor 8 is used as the driving part of connecting shaft 7, for rotating with connecting shaft 7 and acceleration wheel 2.

[0054] Acceleration wheel 2 is made of magnetic material such as metal iron, cobalt and nickel, and acceleration wheel 2 and impact plate 4 are made of magnetic material such as metal iron, cobalt and nickel.Inside acceleration wheel 2 is fixedly installed with coil and iron core, coil is wound outside iron core, and in the state of electrification, coil can make iron core generate magnetic force, and impact plate 4 is magnetically fixed on acceleration wheel 2.

[0055] Two conductive rods are fixedly installed in the inside of connecting shaft 7, the end of connecting shaft 7 away from motor 8 extends out of box body 1, and the conductive rod extends out of the end, and the end of conductive rod extending out is fixedly installed with brush.

[0056] As shown in Figure 4As shown, two conductive rings a are also fixedly installed on the mounting ring 6 without the motor 8, one of which is connected to the positive electrode, and the other is connected to the negative electrode. The brush of one of the conductive rods is rotatably connected to the positive conductive ring, and the brush of the other conductive rod is rotatably connected to the negative conductive ring, which is used to provide direct current to the coil. When the connecting shaft 7 rotates, the brush is always in contact with the inner ring of the conductive ring, and the brush can roll inside the conductive ring. The coil is connected to the conductive rod by a wire, one end of which is fixedly connected to one of the conductive rings, and the other end is fixedly connected to the coil. The coils of the two accelerating wheels 2 are connected in series. Under the condition of power supply, the coil and the core can generate a magnetic field to adsorb the impact plate 4, fix the impact plate 4 and the accelerating wheel 2 together. Then the motor 8 rotates with the accelerating wheel 2, and the acceleration can rotate with the impact plate 4, which is used to provide the rotating speed of the impact plate 4, so that the impact plate 4 has an initial speed. The motor 8 is a variable frequency motor, which can change the output rotating speed of the motor 8.

[0057] Suppose the speed of the motor 8 rotating with the accelerating wheel 2 is W, the distance from the center of the impact plate 4 to the rotating axis of the accelerating wheel 2 is r (since the impact plate 4 has a width, in this embodiment, the center of the impact plate 4 is taken for calculation). The linear speed of the impact plate 4 is V1, then:

[0058] V1 = Wr (1)

[0059] As shown in Figures 2-3 , after the linear speed V1 of the accelerating wheel 2 rotating with the impact plate 4 reaches the preset value, the accelerating wheel 2 moves to the position tangent to the guide rail 3, the coil is powered off, the impact plate 4 moves downward along the tangent direction of the accelerating wheel 2 at the speed V1 (as shown by the arrow in Figure 2 ), and enters the guide rail 3 to move downward along the guide rail 3 (the friction of the guide rail 3 is ignored here).

[0060] Since the tangent point of the accelerating wheel 2 and the guide rail 3 is fixed, the distance h between the tangent point and the upper end surface of the base 5 is always unchanged, that is, the vertical movement distance of the impact plate 4 remains unchanged, which is always h.

[0061] The movement time of the impact plate 4 can be directly measured as t1, and the speed of the impact plate 4 moving to the bottom of the base 5 is V2, then:

[0062] V2 = V1 + gt1 (2)

[0063] In the formula: g is the acceleration of gravity, and V1 is the initial speed of the impact plate 4.

[0064] During the impact test, the impact plate 4 hits the workpiece, and its speed decreases from V2 to 0, and the impact time is t2,

[0065] From the momentum formula: Ft2 = m x V2 (3)

[0066] Where m is the mass of the impact plate 4, and F is the acting force;

[0067] From the above formulas (1), (2), (3), we can get:

[0068] Ft2 = m x (Wr + gt1) (4)

[0069] The impact plate 4 has an initial speed V1 when moving in the vertical direction, which is provided by the accelerating wheel 2, that is, the speed can directly act on the part to be tested. While the impact plate 4 has a high initial speed, the time of the impact plate 4 moving in the vertical direction can be ignored. Then formula (4) can be approximated as: Ft2 = m x Wr

[0070] From the analysis, it can be seen that the impulse Ft2 is related to the rotating speed W of the accelerating wheel 2, and the greater the rotating speed W, the greater the impulse. Therefore, the height of the impact plate 4 can be ignored here, and the impulse generated can be completely provided by the speed V1 of the impact plate 4.

[0071] In the case of considering the time of the impact plate 4 moving in the vertical direction, assuming that the time of moving in the vertical direction is t1, according to the displacement formula, we can get:

[0072] h = (V1 + gt1 / 2) x t1 (5)

[0073] Where h is the distance between the point of intersection of the accelerating wheel 2 and the guide rail 3 and the base 5;

[0074] V1 is the linear speed of the impact plate 4;

[0075] g is the acceleration of gravity.

[0076] The time t1 of the impact plate 4 moving can also be directly obtained from formula (5). The required impulse Ft2 can be directly obtained from formula (4) and formula (5).

[0077] In further embodiments, in order to improve the function of the base 5, so that the base 5 can perform more experimental operations, and as much as possible to reduce the occupied space, and achieve the purpose of all-in-one, a vibration test bench is also arranged on the base 5.

[0078] As shown in Figures 5-8 The top of the base 5 is provided with a mounting groove 9, and a bearing plate 12 is mounted in the mounting groove 9. The bearing plate 12 can move up and down in the mounting groove 9. The bottom of the mounting groove 9 is also fixedly provided with a plurality of support plates 11 which are cross-distributed. As shown in Figure 7As shown, the support plates 11 are arranged in cross, supporting the bearing plate 12. When the bearing plate 12 is located in the mounting groove 9, the bottom surface of the bearing plate 12 is just located on the support plates 11, and the upper end surface of the bearing plate 12 is flush with the upper end surface of the base 5, ensuring that the base 5 is a complete plane.

[0079] As shown in Figure 5 and Figure 7 , the bottom of the mounting groove 9 is provided with a hydraulic rod 13, the outer cylinder of the hydraulic rod 13 is fixedly installed at the bottom of the mounting groove 9, and the telescopic end of the hydraulic rod 13 is fixedly provided with a first motor 14. The hydraulic rod 13 is connected with a hydraulic oil tank through a hydraulic pipeline for providing power to the hydraulic rod 13. The output end of the first motor 14 is fixedly provided with a rotating seat 15, and an eccentric connecting column 18 is arranged on the rotating seat 15 and fixedly connected with the rotating seat 15. A cylindrical barrel 19 is sleeved on the outer side of the connecting column 18, and the cylindrical barrel 19 can rotate on the outer side of the connecting column 18. The top of the cylindrical barrel 19 is fixedly connected with the bottom center of the bearing plate 12.

[0080] Before using the bearing plate 12, the hydraulic rod 13 needs to be lifted with the bearing plate 12 to separate from the mounting groove 9. When the first motor 14 rotates, it can rotate the rotating seat 15 around the shaft axis of the first motor 14. When the rotating seat 15 rotates, it will rotate the connecting column 18 around the shaft axis of the rotating seat 15, so that the connecting column 18 will swing the cylindrical barrel 19 and the bearing plate 12 around the shaft axis of the rotating seat 15 and the first motor 14, thereby generating transverse vibration. The four corners of the bottom of the bearing plate 12 and the bottom of the mounting groove 9 are fixedly provided with springs 10, which provide tension to the bearing plate 12, making the bearing plate 12 more stable when horizontally vibrating.

[0081] In addition to the eccentric connection between the connecting column 18 and the rotating seat 15, in order to realize the multi-directional vibration of the bearing plate 12, as shown in Figure 9 , a horizontal plate 16 is rotatably installed on the rotating seat 15 through a fastening bolt 17. The fastening bolt 17 can adjust the tightness between the horizontal plate 16 and the rotating seat 15. Loosening the fastening bolt 17, the horizontal plate 16 can rotate around the shaft axis of the fastening bolt 17. Tightening the fastening bolt 17 can fix the rotating seat 15 and the horizontal plate 16 together.

[0082] The connecting column 18 is fixedly installed on the upper end surface of the horizontal plate 16 and is perpendicular to the horizontal plate 16, as shown in Figures 8-10 . The connecting column 18 is eccentrically arranged with the rotating shaft axis of the rotating seat 15.

[0083] In use, when the horizontal plate 16 is kept in a horizontal position, the connecting column 18 is kept in a vertical position, as shown in Figure 9As shown, the first motor 14 rotates the rotating base 15, which in turn rotates the horizontal plate 16 and the connecting column 18 around the axis of the rotating base 15, thereby causing the bearing plate 12 to vibrate in the horizontal direction.

[0084] When the vibration direction needs to be adjusted, the fastening bolt 17 is loosened, and the horizontal plate 16 is rotated so that it rotates around the axis of the fastening bolt 17. As shown in the figure, Figure 10 As shown by the arrow, the horizontal plate 16 is rotated downward along the direction of the arrow (the horizontal plate 16 can also be rotated upward). After the horizontal plate 16 is rotated downward, the connecting column 18 is in an inclined state, and the bearing plate 12 is also in an inclined state. In principle, the greater the angle at which the horizontal plate 16 is rotated downward, the greater the inclination angle of the connecting column 18, and the greater the inclination angle of the bearing plate 12. After the horizontal plate 16 is rotated downward, the fastening bolt 17 is tightened to keep the angle of the horizontal plate 16 unchanged.

[0085] As shown in the figure, Figure 10 When the bearing plate 12 is in an inclined state, the support point of the cylindrical tube 19 on the bearing plate 12 is still the center of the bottom surface of the bearing plate 12. The first motor 14 rotates the rotating base 15, which in turn rotates the horizontal plate 16 and the connecting column 18. As shown in the figure, Figure 11 The rotating axis of the rotating base 15 is b, and the axis extension line of the connecting column 18 is c. As shown in the figure, Figure 11 It can be directly seen that the axis line c and the rotating axis b intersect at a point along the direction in which the horizontal plate 16 is rotated (i.e., along the downward direction), and there is an included angle between the axis line c and the rotating axis b. When the connecting column 18 rotates around the rotating axis b, the bearing plate 12 will oscillate around the oscillation axis of the top end trajectory of the connecting column 18 at the upper end of the connecting column 18.

[0086] In a further embodiment, as shown in the figure, Figure 12 A bearing ring 20 is fixedly installed on the upper end of the housing of the first motor 14. The upper end surface of the bearing ring 20 is uneven, and the end of the horizontal plate 16 far from the rotating base 15 can contact the bearing ring 20 in the maximum inclined state of the horizontal plate 16. The end of the horizontal plate 16 contacting the bearing ring 20 is in a hemispherical structure to minimize the contact surface between the horizontal plate 16 and the bearing ring 20. When the horizontal plate 16 is rotated by the connecting column 18, the end of the horizontal plate 16 far from the rotating base 15 slides on the bearing ring 20. Due to the unevenness of the bearing ring 20, the horizontal plate 16 will rotate up and down around the fastening bolt 17, thereby generating vibration in the approximately vertical direction. In this embodiment, since the horizontal plate 16 needs to rotate up and down, the fastening bolt 17 needs to be kept loosened in the maximum inclined state of the horizontal plate 16 to avoid interference with the rotation of the horizontal plate 16.

[0087] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described. It is intended, therefore, to cover all modifications and adaptions that fall within the scope of the claims and their equivalents.

Claims

1. A composite test chamber, characterized in that: The enclosure includes a box (1) with an opening on one side. A heating device and a humidity control device are fixedly installed inside the box (1). A guide rail (3) is provided on the inner wall of the box (1). An acceleration wheel (2) is rotatably installed on the top of the inner cavity of the box (1). One side of the acceleration wheel (2) is located in the guide rail (3). Two symmetrical inner walls of the box (1) are fixedly installed with outwardly protruding mounting rings (6). The acceleration wheel (2) is rotatably installed in the mounting rings (6), and the side of the guide rail (3) near the acceleration wheel (2) is connected to the mounting rings (6). The edge of the acceleration wheel (2) can move into the guide rail (3). An electromagnet is fixedly installed on the acceleration wheel (2). The electromagnet attracts an impact plate (4). The acceleration wheel (2) is made of magnetic material. A coil and an iron core are fixedly installed inside the acceleration wheel (2). When energized, the coil can cause the iron core to generate magnetic force, thus... The impact plate (4) is magnetically fixed to the acceleration wheel (2); the acceleration wheel (2) rotates, which can rotate the impact plate (4) together, and is used to provide the speed of the impact plate (4); the base (5) is fixedly installed at the bottom of the inner cavity of the box (1) as a support platform for the experimental parts. The top of the base (5) is provided with an installation groove (9), and a support plate (12) that can extend upward is installed in the installation groove (9); a hydraulic rod (13) is fixedly installed at the bottom of the installation groove (9), a first motor (14) is fixedly installed at the telescopic end of the hydraulic rod (13), a rotating seat (15) is fixedly installed at the output end of the first motor (14), a connecting column (18) is eccentrically arranged on the rotating seat (15), a cylindrical tube (19) is rotatably fitted on the outside of the connecting column (18), and the top of the cylindrical tube (19) is fixedly connected to the bottom of the support plate (12) to generate lateral vibration.

2. The composite test chamber according to claim 1, characterized in that: The guide rail (3) is fixedly installed on two symmetrical inner side walls of the housing (1); the side of the acceleration wheel (2) facing the inside of the housing (1) is flush with the inner side wall of the housing (1) and the guide rail (3); a connecting shaft (7) is fixedly installed between the two acceleration wheels (2), and a driving component is also fixedly installed on the outside of the housing (1) for rotating the connecting shaft (7) and the acceleration wheel (2).

3. A composite test chamber according to claim 2, characterized in that: A motor (8) is fixedly installed on one side of the housing (1), and the output shaft of the motor (8) is fixedly connected to the connecting shaft (7).

4. A composite test chamber according to claim 3, characterized in that: The connecting shaft (7) passes through the acceleration wheel (2) and is fixedly connected to the acceleration wheel. A wire is connected between the coil and the connecting shaft (7). A brush is installed at one end of the connecting shaft (7) that extends out of the housing (1). The brush is connected to DC power to supply power to the coil.

5. A composite test chamber according to claim 1, characterized in that: When the support plate (12) is located inside the mounting groove (9), the top of the support plate (12) is flush with the upper surface of the base (5).

6. A composite test chamber according to claim 1, characterized in that: A horizontal plate (16) is mounted on the rotating seat (15) by fastening bolts (17). When the fastening bolts (17) are loosened, the horizontal plate (16) can rotate around the axis of the fastening bolts (17). The connecting column (18) is fixedly installed on the upper end face of the horizontal plate (16) and is eccentrically set with respect to the rotation axis of the rotating seat (15).

7. A composite test chamber according to claim 1, characterized in that: Springs (10) are fixedly installed between the four bottom corners of the support plate (12) and the bottom of the mounting groove (9).

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